The Seattle-based online retailer is not required to collect the 7 percent state sales tax for purchases like brick-and-mortar retailers do. That has led to what Greenwald and others believe is an unfair advantage for Internet-based sellers, because they can sell their products more cheaply than local merchants.
New Jersey stands to collect $200 million or more a year in sales taxes if Amazon locates there, after its exemption ends.
So if I take $200M in tax revenue and divide by 7% sales tax I get $2,857,142,857 or approx $2.9B in sales going through those distribution centers?

Read more: APNewsBreak: Amazon in talks for NJ warehouses